Planning Mercedes S123 (station wagon) conversion

Hello everyone,

I've been considering a conversion for quite a while now, finally thought to give a more thorough planning a "go"...
Object of desire is a Mercedes 123 station wagon from the mid 80s (these cars have a classic transmission layout, engine in the front, rear wheel-drive)

My mechanical skills I'd consider above average, have been into restoring classic cars for quite a while.

Been lurking around in this forum for many days now, but still more questions than answers.

I like the idea of getting rid of the whole drive train and replace it with a Tesla motor in the rear.
The 123 station wagon have no classic spare wheel well (spare wheel is stored at the side/inside the trunk), so the underbody in the rear is flat, should make fitting the electric motor easier.

I'm not particularly performance-orientated, yet the most powerful engine in these cars back then had 185 horsepower, I'd like to end up somewhere in that region.

Desired minimum range is 100 km.
Budget-wise I hope to stay below 20 k€ for the components.

Have not yet thought about batteries in detail...

I have not purchased a car yet, as my workshop is currently blocked with another project which I hopefully will finish soon.
But I wanted to start planning / buying some components in the meantime.

Biggest concern at the moment is getting the conversion street-legal. I am aware of the regulations in Germany, especially EMC and therefore the need of an "understanding" technical inspector. Have already asked the local TÜV Süd here (technical Inspection organisation) but they said they are not capable of doing this...

Anyone has an adress / contact of a TÜV prefferably in South Germany (Baden Württemberg)?

I want to get this topic straight before spending money....


Thanks, Stefan